URBAN STREAM RESTORATION STRUCTURES

摘要

The growth of urban centres had led to a decline in the quality of numerous watercourses and riverine ecosystems. Different form of degradation has occurred in water course not only because of impacts of urbanisation on the hydrologic and hydraulic conditions, but also because of the presence of in-stream works. Concrete and other hard structures have modified the natural corridor characteristics, causing its progressive degradation. Consequently the necessity of mitigating some of these works has brought a new attention to stream restoration, which is defined as the structural and functional return of a degraded riverine ecosystem to its pre-disturbance conditions.